I have Kubuntu installed in a VirtualBox (Windows host), but as of the latest updgrades it won't boot anymore.
I found an earlier kernel that works, though, and I want to set it to default.
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What I do
When I boot, I press shift so as to see this:
I go to Advanced options for Ubuntu, to see:
and I wrote which one I want to boot.
It is the 6th, counting the first at 0.
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On Kubuntu, I go to /etc/default, open grub, change GRUB_DEFAULT from 0 to 6, then run update-grub.
But it still does not work when I reboot the virtual machine.
